TP pb smtimes on multiplayer maps.

Hello.
We do play our endgame maps at 2 players, it happens that i can't use the portal to join my friend in the map. He uses "his" waystones.
ie. on a "steppe" map, i couldn t reach the area and finish the map with him, i wasn't dead, and one portal was remaining.
I tried to click on it, no teleportation available.
Once, we had the same probleme, he came back to the outpost which enabled me to see the name of the map, so I was able to go back there... Thanks